I would knock Vivica out of contention for now. Slow healer with cleanse is handy but… still slow Particularly when you have a swathe of faster 4* emblemed healers.
So that takes us down to Malosi, Zim or Kong.
Of those, Malosi is probably the most versatile in terms of his status effect blocking BUT he can also work in that role at 3-70. Additionally, for “evenness” you already have 3x 80s in yellow but only 2x in Red… So Red could do with a bit more propping up (especially given wars being mainly green tanks currently).
Kong & Zimkitha are both amazing options. Both are red (which is handy for wars) and both do a full team cleanse.
Zimkitha does less damage with an attack buff and is FASTER. Kong on the other hand does a lot lot more damage, has a high attack stat and gives the ice buff (handy vs. Vela flanks).
If it came down to an
b I would probably be leaning towards kong for the extra damage, particularly as you have a +19 Boldtusk already for attack buff… But you could honestly coin-flip the two of them and wouldn’t be disappointed either way I don’t think!